Restart not mandatory. Infact its not allowed. You will comeup with message
" the machine cannot be rebooted. you can finish the task once you are done with the steps"
Task succeeded with the below steps.
storage server @ root
systemctl enable nfs-server
systemctl enable rpcbind
chkconfig rpcbind on
chkconfig nfs-server on
systemctl start nfs-server
systemctl start rpcbind
vi /etc/exports
/webdata 172.16.238.10(rw,sync,no_root_squash)
/webdata 172.16.238.11(rw,sync,no_root_squash)
/webdata 172.16.238.12(rw,sync,no_root_squash)
exportfs -a
showmount -e ststor01
[it should reflect entries in /etc/exports]
[it may still show old entries, i ignored and proceed further]
on App servers @ root
systemctl enable nfs-server
systemctl enable rpcbind
chkconfig rpcbind on
chkconfig nfs-server on
systemctl start nfs-server
systemctl start rpcbind
mount -t nfs ststor01:/webdata /var/www/html
df -h
mount | grep nfs